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Appendix B
Glossary
Adjusted position -
The final position of a survey point
derived from an adjustment of the measurements used to
derive the position.
Almanac -
A set of orbit parameters that allows calculation
of approximate GPS satellite positions and velocities. The
almanac contains data that is used by a GPS receiver to
determine satellite visibility and as an aid during
acquisition of GPS satellite signals. The almanac data is
downloaded from each satellite over the course of 12.5
minutes. The data contains orbital parameter
approximations for all satellites, GPS to universal time
conversion parameters, and single-frequency ionospheric
model parameters
Ambiguity -
The unknown integer number of cycles of the
reconstructed carrier phase contained in an unbroken set of
measurements from a single satellite pass at a single
receiver. Also known as integer ambiguity and integer bias.
Antenna -
The antenna is the component of a GPS system
that collects the analog signal from the GPS satellite and
sends this signal to the GPS receiver for processing.
Autonomous position -
An autonomous position is derived
from a single receiver without using any differential
correction. This is the least accurate method of positioning.
Azimuth -
The angle formed (in a clockwise direction)
between True North (0 degrees) typically, and a chosen
point.
Baseline -
The three-dimensional vector distance between a
pair of stations for which simultaneous GPS data has been
collected and processed with differential techniques. The
most accurate GPS result.
750-1-0093 Rev 1.book Page 95 Friday, June 28, 2002 4:02 PM
